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Subject
- Geology81
- Mines and mineral resources37
- Land use, Rural16
- Power resources9
- Minerals6
- Natural gas6
- Gas companies4
- Geothermal resources4
- Coal3
- Geology, Structural3
- Groundwater3
- Water table3
- Aquifers2
- Earth temperature2
- Electric lines2
- Electric power transmission2
- Geology, Stratigraphic2
- Roads2
- Census districts1
- Central business districts1